php合并两个二维数组,如果有两组相同值,只取一个,如何实现

piaoyudesi

循环出来的数组如下：我现在要合并这两个数组，相同的值我主要取第二个数组的值，请问该如何实现，谢谢！
Array
(
    [0] => 11/19/2009
    [1] => 16:42:48
    [2] => CTT
    [3] => Andrew Crossley
    [4] => Shopping Cart Payment Received
    [5] => Completed
    [6] => GBP
    [7] => 57.98
    [8] => -2.06
    [9] => 55.92
    [10] => a.crossley@accord-is.co.uk
    [11] => order@laptops-battery.co.uk
    [12] => 2RH921927T583313X
    [13] => Non-U.S. - Unregistered
    [14] => Andrew Crossley, 74 Gravel Hill, Croydon, Surrey, CR05BE, United Kingdom
    [15] => Confirmed
    [16] => Shopping Cart
    [17] =>
    [18] => 8
    [19] =>
    [20] => 0
    [21] =>
    [22] =>
    [23] =>
    [24] =>
    [25] =>
    [26] =>
    [27] =>
    [28] =>
    [29] =>
    [30] =>
    [31] =>
    [32] => 1
    [33] => 0428-7135-1009-2010
    [34] => 4,939.23
    [35] => 74 Gravel Hill
    [36] =>
    [37] => Croydon
    [38] => Surrey
    [39] => CR05BE
    [40] => United Kingdom
    [41] =>
    [42] => Credit
    [43] =>
)
Array
(
    [0] => 11/19/2009
    [1] => 16:42:48
    [2] => CTT
    [3] => Andrew Crossley
    [4] => Shopping Cart Item
    [5] => Completed
    [6] => GBP
    [7] => 49.98
    [8] =>
    [9] =>
    [10] => a.crossley@accord-is.co.uk
    [11] => order@laptops-battery.co.uk
    [12] => 2RH921927T583313X
    [13] => Non-U.S. - Unregistered
    [14] => Andrew Crossley, 74 Gravel Hill, Croydon, Surrey, CR05BE, United Kingdom
    [15] => Confirmed
    [16] => 11.1V 6600mAh Dell latitude D820 battery
    [17] => 104036
    [18] => 8
    [19] =>
    [20] => 0
    [21] =>
    [22] =>
    [23] =>
    [24] =>
    [25] =>
    [26] =>
    [27] =>
    [28] =>
    [29] =>
    [30] =>
    [31] =>
    [32] => 1
    [33] => 0428-7135-1009-2010
    [34] => 4,939.23
    [35] => 74 Gravel Hill
    [36] =>
    [37] => Croydon
    [38] => Surrey
    [39] => CR05BE
    [40] => United Kingdom
    [41] => Memo
    [42] =>
    [43] =>
)
..............